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SUBTRACTION Self-Correcting Quiz - NINES

1
10
-  9
2
14
-  9
3
10
-  9
4
15
-  9
5
18
-  9
6
13
-  9
7
17
-  9
8
13
-  9
9
16
-  9
10
17
-  9
11
12
-  9
12
12
-  9
13
11
-  9
14
15
-  9
15
16
-  9
16
11
-  9
17
18
-  9
18
14
-  9
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